OM11014 NXP Semiconductors, OM11014 Datasheet - Page 36

• Manufacturer Part Number: OM11014
• Description: BOARD EVAL FOR LPC2919
• Manufacturer: NXP Semiconductors
• Series: Keilr
• Type: MCUr

Specifications of OM11014

• Contents: Board, Cable, CD
• For Use With/related Products: LPC2919
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 568-4360

NXP Semiconductors
LPC2917_19_1
Product data sheet
8.7.6.1 Overview
8.7.6.2 Description
8.7.6 PWM
The frequency of all the CLK_MSCSS_ADCx_APB clocks is identical to
CLK_MSCSS_APB since they are derived from the same base clock
BASE_MSCSS_CLK. Likewise the frequency of all the CLK_ADCx clocks is identical
since they are derived from the same base clock BASE_ADC_CLK.
The register interface towards the system bus is clocked by CLK_MSCSS_ADCx_APB.
Control logic for the analog section of the ADC is clocked by CLK_ADCx, see also
Figure
The MSCSS in the LPC2917/19 includes four PWM modules with the following features.
The ability to provide flexible waveforms allows PWM blocks to be used in multiple
applications; e.g. automotive dimmer/lamp control and fan control. Pulse-width modulation
is the preferred method for regulating power since no additional heat is generated and it is
energy-efficient when compared with linear-regulating voltage control networks.
The PWM delivers the waveforms/pulses of the desired duty cycles and cycle periods. A
very basic application of these pulses can be in controlling the amount of power
transferred to a load. Since the duty cycle of the pulses can be controlled, the desired
amount of power can be transferred for a controlled duration. Two examples of such
applications are:
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Six pulse-width modulated output signals
Double edge features (rising and falling edges programmed individually)
Optional interrupt generation on match (each edge)
Different operation modes: continuous or run-once
16-bit PWM counter and 16-bit prescale counter allow a large range of PWM periods
A protective mode (TRAP) holding the output in a software-controllable state and with
optional interrupt generation on a trap event
Three capture registers and capture trigger pins with optional interrupt generation on
a capture event
Interrupt generation on match event, capture event, PWM counter overflow or trap
event
A burst mode mixing the external carrier signal with internally generated PWM
Programmable sync-delay output to trigger other PWM modules (master/slave
behavior)
Automotive dimmer controller: The flexibility of providing waves of a desired duty cycle
and cycle period allows the PWM to control the amount of power to be transferred to
the load. The PWM functions as a dimmer controller in this application
Motor controller: The PWM provides multi-phase outputs, and these outputs can be
controlled to have a certain pattern sequence. In this way the force/torque of the
motor can be adjusted as desired. This makes the PWM function as a motor drive.
9.
Rev. 01 — 31 July 2008
ARM9 microcontroller with CAN and LIN
LPC2917/19
© NXP B.V. 2008. All rights reserved.
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